Auger



UNITED sTATEs PATENT oEEicE,

NAPOLEON B. PHELPS, OF ROCHESTER, NEW YORK. l

AUGER.

Specification of Letters Patent No. 26,613, dated December 27, 1859i To all whom t may concern:

Be it known that I, NAPOLEON B. PHELPs, of Rochester, in the county of Monroe and State of New York, have invented a new and useful Improvement in Angers and Bits; and I do hereby declare that the following is a full and exact description thereof, reference being had to the accompanying drawings, making part of this specification, in Which- Figure l, is an end view; Fig, a perspective View of the cutting and clearing port-ion of the auger; Fig. 3, a side elevation, in a position in which the cutting edges are directed toward the observer; Fig. 4, is an elevation representing a position the reverse of that shown in Fig'. 3.

Similar letters refer to corresponding parts in all of the figures.

My improvement is applicable to bits and augers of the kinds known as the double and single twist, and consists, as applied to the latter, in uniting the end of the helical rod where it terminatesin the cutting lip,`

with the preceding coil so as to constitute what I term the supported cut, and form an arch over the cavity of the helix, for the support of the conical screw. l

As represented in the drawings a is vthe rod which forms the twist of the auger, b is the conical screw, c the primary or transverse cutter continued from the thread of the screw b to the periphery; CZ is the extended portion which unites the last coils of the helix, and forms (its front edge being made sharp) the advance cutter c, while f is the solid portion, or head of the bit, and g the` throat therein, through which the chips pass.

The uniting of the end of the rod with the preceding coil may be effected by welding the parts, or by leaving the metal designed to form the head of the auger solid, and drilling or punchingthe throat g; and

by various other methods; `that `will accom-l1 s readily perceived is the "securing greater Y strength to the cutting lip, which, from the plish the same result. Itsyobject it will be thinness necessary to the formation of a good cutting edge, is `extremely liable `to break g` and also obviating the tendency of the tool to diverge from its course in boring.` This it accomplishes effectuallyby the extent l of solid surface which itl presents to the wood, and byits inability to` spring or .vi-1` 5a` brate while being worked. The screw b, be` ing firmly supported in thecenter, derives its strength from the sanne principle of con` struction which confers durability andrmness to the cuttingedge,as embodied inthe .n i l Y This construction readilyadmits of lthe l supporting and uniting wall nl.`

cutters being finished with therequiredcare," and afterward kept sharp, by the facility l with which a tile may be passed through the throat g; while it completely overcomes the liability of the single screw auger to untwist at the point whenoperatedin `hard material,

This change in the construction of angers l and bits constitutes animportantimprove-- ment, inasmuch asitmakes theltool stronger and more durable, as well ascapable .of` bor-` ing more accurately for long dlstances, as 1s required in ship carpentry, andmanyother branches of industry. l l i l,

What I claim as my invention and desire to secure by LettersPatent, is-

Uniting and y combining the terminatingly` coil with the preceding one by means ofthe;l i

thin supporting wall d, acting as a brace to l sustain and strengthen the cutting portion of the bit or auger, substantially inthe manner and for the purposeshown and described.`

Witnesses:

J. FRASER, S. J. ALLIs.`

N. 33; PHELPs; l l 

